Finding the Fourth Proportional to 3,900.35, 5,382.30 and 2,131.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.35 : 5,382.30 = 2,131.96 : x
2. Step 2: Convert to fraction form
   3,900.35/5,382.30 = 2,131.96/x
3. Step 3: Cross multiply
   3,900.35x = 5,382.30 × 2,131.96
4. Step 4: Simplify right side
   3,900.35x = 11,474,826.86
5. Step 5: Solve for x
   x = 11,474,826.86/3,900.35
6. Step 6: Final answer
   x = 2,942.00